Ok, now I have the full understanding of the affected components:

gnome-sound-properties was set to AlsaMixer as default mixer device (Intel 
82801DB-ICH4) and 
ALL mixer tracks were selected. The track "IEC958 Playback AC97-SPSA" allows 
only this 4 levels
of control - so the mixer hotkeys (controlled by gnome-settings-daemon) just 
used the common 
determinator und could not use the more granular setting in 
/apps/gnome_settings_daemon/volume_step. All other tracks can be controlled in 
steps of 6%. 
Disabling the IEC958 track or changing to the pulseaudio mixer solved the 
problem 
as expected.

But there is still the regression: why did the behaviour change between
Hardy and Intrepid?

BTW: the design is unintuitive - why is the volume_step not merged into 
/apps/gnome-volume-control 
and not exposed in the GUI? ... I will file a bug against gnome.

-- 
[Intrepid] regression: only 4 volume levels with hotkeys
https://bugs.launchpad.net/bugs/301982
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